380 LABORATORY MANUAL OF HUMAN ANATOMY 



its parts backward, separating each from the M. ciliaris; pin 

 these down to the bottom of a cork-lined tray. Examine the iris 

 and then cautiously remove it. 



In the ciliary disk (orbiculus ciliaris) examine 



(a) Ciliary muscle (M. ciliaris). 



(aa) Meridional fibres (fibrae meridionales [Brueckei]). 



(ab) Circular fibres (fibrae circulares [Mulleri]). 



These are best distinguished in a thin meridional section through 

 the corpus ciliare under the microscope. 



(b) Ganglionic ciliary plexus (plexus gangliosus ciliaris}. 



Look for it at the junction of the chorioidea with the corpus 

 ciliare. 



In the DIAPHRAGM OF THE EYE (iris) study 



(a) Pupillary margin (mar go pupillaris). 



(b) Ciliary margin (mar go ciliaris). 



(c) Anterior surface (fades anterior). 



(d) Posterior surface (fades posterior). 



FIG. 183. 



Orbiculus ciliaris, Annulus ciliaris 



Chorioidea ! i Iris (facies anterior) 



MM 



Margo ciliaris - 



(iridis) 



Annulus iridis major / / fcupilla 

 Circulus iridis minor 'Annulus iridis minor 



The iris ("rainbow") of a clear gray eye, with the adjacent part of the sclerotic coat. Seen from in 

 front. (After Toldt, Anat. Atlas, Wien, 1903, 3 Aufl., p. 896, Fig. 1347.) 



(e) Greater ring of iris (annulus iridis major), between iris and corpus 



ciliare. 

 (/) Lesser ring of iris (annulus iridis minor), between ciliary zone (zona 



ciliaris} and pupillary zone (zona pupillaris} of iris. 

 (g) Folds of iris (plicae iridis). 

 (h) Pupil (pupilla). 



(i) Sphincter muscle of pupil (M. sphincter pupillae). 

 (j) Stroma of iris (stroma iridis) . 

 (k) Dilator muscle of pupil (M. dilator pupillae). 

 (1) Pectinate ("comb-like") ligament of iris (Lig. pectinatum iridis) (0. 



T. pillars of the iris). Observe the relation of the fibres of this 



ligament to those of Descemet's lamina. 

 (m) Spaces of Fontana at the angle of the iris (spatia anguli iridis [Fon- 



tanae]). 



